120021639 has 8 divisors (see below), whose sum is σ = 160079472. Its totient is φ = 79989120.

The previous prime is 120021631. The next prime is 120021661. The reversal of 120021639 is 936120021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120021639 - 2³ = 120021631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15279 + ... + 21759.

It is an arithmetic number, because the mean of its divisors is an integer number (20009934).

Almost surely, 2^120021639 is an apocalyptic number.

120021639 is a deficient number, since it is larger than the sum of its proper divisors (40057833).

120021639 is an equidigital number, since it uses as much as digits as its factorization.

120021639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12657.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 120021639 is about 10955.4387862833. The cubic root of 120021639 is about 493.2720610637.

The spelling of 120021639 in words is "one hundred twenty million, twenty-one thousand, six hundred thirty-nine".